/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package com.feilong.lib.org.apache.http.config;

import java.nio.charset.Charset;
import java.nio.charset.CodingErrorAction;

import com.feilong.lib.org.apache.http.Consts;
import com.feilong.lib.org.apache.http.annotation.Contract;
import com.feilong.lib.org.apache.http.annotation.ThreadingBehavior;
import com.feilong.lib.org.apache.http.util.Args;

/**
 * HTTP connection configuration.
 *
 * @since 4.3
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class ConnectionConfig implements Cloneable{

    public static final ConnectionConfig DEFAULT = new Builder().build();

    private final int                    bufferSize;

    private final int                    fragmentSizeHint;

    private final Charset                charset;

    private final CodingErrorAction      malformedInputAction;

    private final CodingErrorAction      unmappableInputAction;

    private final MessageConstraints     messageConstraints;

    ConnectionConfig(final int bufferSize, final int fragmentSizeHint, final Charset charset, final CodingErrorAction malformedInputAction,
                    final CodingErrorAction unmappableInputAction, final MessageConstraints messageConstraints){
        super();
        this.bufferSize = bufferSize;
        this.fragmentSizeHint = fragmentSizeHint;
        this.charset = charset;
        this.malformedInputAction = malformedInputAction;
        this.unmappableInputAction = unmappableInputAction;
        this.messageConstraints = messageConstraints;
    }

    public int getBufferSize(){
        return bufferSize;
    }

    public int getFragmentSizeHint(){
        return fragmentSizeHint;
    }

    public Charset getCharset(){
        return charset;
    }

    public CodingErrorAction getMalformedInputAction(){
        return malformedInputAction;
    }

    public CodingErrorAction getUnmappableInputAction(){
        return unmappableInputAction;
    }

    public MessageConstraints getMessageConstraints(){
        return messageConstraints;
    }

    @Override
    protected ConnectionConfig clone() throws CloneNotSupportedException{
        return (ConnectionConfig) super.clone();
    }

    @Override
    public String toString(){
        final StringBuilder builder = new StringBuilder();
        builder.append("[bufferSize=").append(this.bufferSize).append(", fragmentSizeHint=").append(this.fragmentSizeHint)
                        .append(", charset=").append(this.charset).append(", malformedInputAction=").append(this.malformedInputAction)
                        .append(", unmappableInputAction=").append(this.unmappableInputAction).append(", messageConstraints=")
                        .append(this.messageConstraints).append("]");
        return builder.toString();
    }

    public static ConnectionConfig.Builder custom(){
        return new Builder();
    }

    public static ConnectionConfig.Builder copy(final ConnectionConfig config){
        Args.notNull(config, "Connection config");
        return new Builder().setBufferSize(config.getBufferSize()).setCharset(config.getCharset())
                        .setFragmentSizeHint(config.getFragmentSizeHint()).setMalformedInputAction(config.getMalformedInputAction())
                        .setUnmappableInputAction(config.getUnmappableInputAction()).setMessageConstraints(config.getMessageConstraints());
    }

    public static class Builder{

        private int                bufferSize;

        private int                fragmentSizeHint;

        private Charset            charset;

        private CodingErrorAction  malformedInputAction;

        private CodingErrorAction  unmappableInputAction;

        private MessageConstraints messageConstraints;

        Builder(){
            this.fragmentSizeHint = -1;
        }

        public Builder setBufferSize(final int bufferSize){
            this.bufferSize = bufferSize;
            return this;
        }

        public Builder setFragmentSizeHint(final int fragmentSizeHint){
            this.fragmentSizeHint = fragmentSizeHint;
            return this;
        }

        public Builder setCharset(final Charset charset){
            this.charset = charset;
            return this;
        }

        public Builder setMalformedInputAction(final CodingErrorAction malformedInputAction){
            this.malformedInputAction = malformedInputAction;
            if (malformedInputAction != null && this.charset == null){
                this.charset = Consts.ASCII;
            }
            return this;
        }

        public Builder setUnmappableInputAction(final CodingErrorAction unmappableInputAction){
            this.unmappableInputAction = unmappableInputAction;
            if (unmappableInputAction != null && this.charset == null){
                this.charset = Consts.ASCII;
            }
            return this;
        }

        public Builder setMessageConstraints(final MessageConstraints messageConstraints){
            this.messageConstraints = messageConstraints;
            return this;
        }

        public ConnectionConfig build(){
            Charset cs = charset;
            if (cs == null && (malformedInputAction != null || unmappableInputAction != null)){
                cs = Consts.ASCII;
            }
            final int bufSize = this.bufferSize > 0 ? this.bufferSize : 8 * 1024;
            final int fragmentHintSize = this.fragmentSizeHint >= 0 ? this.fragmentSizeHint : bufSize;
            return new ConnectionConfig(bufSize, fragmentHintSize, cs, malformedInputAction, unmappableInputAction, messageConstraints);
        }

    }

}
